Truck bed liner



FIG. 1 is a perspective view of a truck bed liner embodying my new and ornamental design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a truck bed liner, as shown. 